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Retirement Plan - Assumptions to Calculate Net Periodic Costs of SERP (Detail) (SERP [Member])	12 Months Ended
	Jun. 26, 2014	Jun. 27, 2013	Jun. 28, 2012
SERP [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	4.90%	4.17%	5.51%
Rate of compensation increases	4.50%	4.50%	4.50%
Bonus payment	60% - 70% of base, paid 3 of 5 years	60% - 70% of base, paid 3 of 5 years	60% - 70% of base, paid 3 of 5 years

X

- Definition

Assumed amount and frequency of bonus payment used in calculating benefit obligation of the SERP.

+ References

No definition available.

+ Details

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Namespace Prefix:	jbss_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The interest rate used to adjust for the time value of money.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (k)(1)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Expected rate of compensation increases (for pay-related plans).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (k)(2)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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